Collaborative Research: Resilient and Sustainable Engineered Fiber-Reinforced Earthen Masonry for High Wind Regions

这项合作研究旨在从实验和理论上量化一种新型纤维增强土石砌筑系统在大风地区住宅的结构弹性。这一目标将通过工程和原型稳定土块和砂浆来实现，两者都添加了天然纤维，并通过物理测试验证全尺寸墙壁的结构响应。砂浆和砌块的工程将基于两个标准：稳定剂和纤维用量的优化，以及砌块和砂浆的相容性，其中目标强度定义为在砂浆缝中强制破坏。墙体系统的工程将基于适用的面内和面外力之间相互作用规律的制定和验证。相互作用规律将基于从材料表征和缩放子组件获得的本构模型。这项合作涉及南卡罗来纳大学、内布拉斯加大学林肯分校和佛罗里达大学的教师，每所大学有一名博士生。砌块和砂浆的工程和特性将分别由佛罗里达大学和内布拉斯加大学林肯分校领导。墙的工程，包括分析和实验验证，将由南卡罗来纳大学哥伦比亚分校领导。结果将是一个原型砖和迫击炮组合。所选系统的验证将基于在面内、面外和钟摆冲击载荷下模拟典型飞行碎片冲击能量的全尺寸壁样的验证试验，这些冲击载荷通常会导致人类死亡和伤害。提出的研究将通过砂浆和砌块的工程设计来提高损伤容忍度，并通过基于全尺寸实验的结构系统和预测分析模型的验证来推进知识和技术。该项目的最终成果将是一个新颖的、负担得起的、节能的、适合当地的农村住宅系统，该系统旨在承受高风力负荷，例如美国中西部和东南部的风力负荷。该项目的成果将通过一个夏季研讨会项目向内布拉斯加州印第安保留地的广大受众以及高中生和教师传播。新教材将被纳入参与大学工程专业本科生和研究生的课程中。

This collaborative research aims at experimentally and theoretically quantifying the structural resilience of a new fiber reinforced earthen masonry system for dwellings in high wind regions. This goal will be achieved by engineering and prototyping stabilized earth blocks and mortar, both enhanced with addition of natural fibers, and verifying the structural response of full-scale walls through physical testing. Engineering of the mortar and blocks will be based on two criteria: optimization of the amount of stabilizer and fibers, and compatibility of block and mortar where the target strengths are defined to force failure in the mortar joints. Engineering of the wall system will be based on the formulation and verification of interaction laws between applicable in-plane and out-of-plane forces. The interaction laws will be based on constitutive models obtained from the characterization of materials and scaled subassemblies. The collaboration involves faculty at the University of South Carolina, the University of Nebraska-Lincoln and the University of Florida, with one PhD student at each institution. The engineering and characterization of the blocks and mortar will be lead by the University of Florida and the University of Nebraska-Lincoln, respectively. The engineering of the walls, including analysis and experimental verification, will be lead by the University of South Carolina, Columbia. The outcome will be a prototype block and mortar combination. The verification of the selected system will be based on proof-tests of full-scale wall specimens under in-plane, out-of-plane, and pendulum impact load simulating the impact energy of representative flying debris, which typically cause human deaths and injuries. The proposed research will advance knowledge and technology by engineering both the mortar and blocks to enhance damage tolerance, and through the verification of structural system and predictive analytical models based on full-scale experiments. The final outcome of the project will be a novel, affordable, energy efficient and locally appropriate system for rural dwellings that is designed to withstand high wind loads, such as those experienced in the Midwestern and the Southeastern US. The outcomes of this project will be transferred to a broad audience of Indian reservations in Nebraska and to high-school students and teachers through a summer workshop program. New educational material will be incorporated in courses offered to engineering undergraduate and graduate students at the participating universities.